Missing Part

This seems like a good filter, but the second trip I took it on, the pin holding the handle to the pump body fell out and was lost. Looking at the owner's manual, it looks like this pin is supposed to have a second half to prevent it from falling out, but mine apparently was not assembled correctly, as it didn't have this part from when I bought it. Hopefully I'll have a replacement part quickly, and the pump will actually be fully ready to go.